[BUG] kernel BUG in team driver: buffer overflow in team_add_slave()

[Yeswanth Krishna <yeswanth@linux.ibm.com>]

Hi Team ,

I encountered a kernel crash while running selftests on kernel 7.1.0-rc6
on a POWER10 system. The crash occurs when adding a slave device to a
team interface, triggered by FORTIFY_SOURCE detecting a buffer overflow.

**System Information:**
- Kernel: 7.1.0-rc6-160099.42-default+ (commit d548c6f4301b)
- Architecture: powerpc64le (ppc64le)
- Hardware: IBM POWER10 (9043-MRX), pSeries
- Config: CONFIG_FORTIFY_SOURCE=y

**Crash Location:**

[ 3492.897824][T77143] kernel BUG at lib/string_helpers.c:1044!
[ 3492.898057][T77143] NIP [c000000000ac1120] __fortify_panic+0x18/0x28
[ 3492.898096][T77143] [c00000000efdb350] [c00800000b857a18] 
team_add_slave+0xc60/0xcc0 [team]


**Call Trace:**

__fortify_panic+0x18/0x28
team_add_slave+0xc60/0xcc0 [team]
do_set_master+0x19c/0x240
do_setlink.isra.0+0x388/0x1450
rtnl_newlink+0xac8/0x1030
rtnetlink_rcv_msg+0x450/0x530
netlink_rcv_skb+0x74/0x1b0
rtnetlink_rcv+0x24/0x40
netlink_unicast+0x2e0/0x430
netlink_sendmsg+0x210/0x580
____sys_sendmsg+0x30c/0x470
___sys_sendmsg+0x94/0xf0
__sys_sendmsg+0x84/0x100
system_call_exception+0x154/0x2b0

**Reproducer:**
The crash is 100% reproducible via selftests:
```bash
cd tools/testing/selftests
make -C drivers/net/team run_tests

Please add below reported-by tag:
yeswanth <yeswanth@linux.ibm.com>


Thanks,
Yeswanth Krishna